Left 4 Dead 2 Facts #19 - Multi-tasking
You can use First Aid Kits/Defibs/Ammo Packs while reviving teammates. This could potentially save precious time during a tough fight. You have to hold both your use button (E) and left click (MOUSE1) until the actions are complete, even if the progress bar is not showing.
Sometimes when reviving a teammate while healing your teammate will have a black screen that can only be fixed by restarting the game, so it is more safer to use on bots.
Also at 0:22 holding a Kit on a downed teammate will change the E button on the screen into a crossed first aid sign. Nice little tip for new players.
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